Postfix: Upgrading to Snow Leopard, User+Group Changed

My MacBook has a local postfix setup with a smarthost that I use to send out mails written in mutt. When upgrading from Tiger 10.4 to Snow Leopard / Mac OS X 10.6 (a long time after that came out, skipped 10.5 entirely), the setup failed with the error message:

Life in Athens (Greece) for a foreigner from the other side of the mountains.
And with an interest in digital life and the feeling of change in a big city.
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